version control information that is different from the rest of their
containing document (or at least other sections). For release notes
only, allow output of <sect1info><pubdate></pubdate></sect1info>
text, and add it to three sections of RELNOTESng where it's kind of
important ("What's New" in the release notes, "Supported Device" in
the arch-independent hardware list, and the processors section of the
alpha hardware list).
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